Here's one of two 80 ton Trane roof top units changed out on 4th of July a couple years ago at a local hospital... Had one 24 hour period to get both disconnected, both reconnected and piped for chilled water cooling, on line and in operation. After 38 years in commercial/industrial HVAC, I retired Aug 1, '013.
Had to recover approximately 250 pounds of r-22 prior to removal between the two units. These are considered to be small to mid-sized units, both supplying common ductwork in a three story building.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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